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Updated: Dec 30, 2025

Method for Efficient Refolding and Purification of Chemoreceptor Ligand Binding Domain

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Published on: December 12, 2017

How Bacterial Chemoreceptors Evolve Novel Ligand Specificities.

José Antonio Gavira¹, Vadim M Gumerov², Miriam Rico-Jiménez³

¹Laboratory of Crystallographic Studies, IACT (CSIC-UGR), Armilla, Spain.

|January 23, 2020

Summary

Bacterial chemoreceptors evolved from a broad-spectrum ancestor to specialized forms through gene duplication. Structural analysis reveals how ligand-binding pockets changed, enabling new specificities in Pseudomonas species.

Keywords:

cache domains chemotaxis evolution ligands signal transduction

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Area of Science:

Microbiology
Molecular Biology
Evolutionary Biology

Background:

Bacterial signal transduction heavily relies on chemoreceptor-based pathways.
Pseudomonas aeruginosa utilizes 26 chemoreceptors, including PctA (broad amino acid range), PctB (l-glutamine), and PctC (γ-aminobutyrate).

Purpose of the Study:

To investigate the evolutionary origins and functional diversification of PctA, PctB, and PctC chemoreceptors in Pseudomonas.
To elucidate the structural basis for altered ligand specificities in paralogous chemoreceptors.

Main Methods:

Comparative genomics to trace gene duplication events.
Comparative sequence analysis, X-ray crystallography of ligand-binding domains, and molecular dynamics simulations.

Main Results:

PctA, PctB, and PctC are paralogs originating from sequential duplications of an ancestral broad-spectrum amino acid receptor.
Structural studies identified a conserved recognition motif and key pocket alterations driving the evolution of narrow ligand specificities.
Gene duplication is a frequent mechanism for generating paralogous chemoreceptors with diverse functions in bacteria.

Conclusions:

The evolution of specialized chemoreceptors from a broad-spectrum ancestor is driven by gene duplication and subsequent structural modifications.
This study provides insights into the evolutionary principles governing sensory protein diversification in bacteria.